public class MCP23017 extends AbstractDeviceFactory implements GpioDeviceFactoryInterface, InputEventListener<DigitalInputEvent>, Closeable
The MCP23X17 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits (IODIRA/B). The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.
The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and PORTB). The MCP23X17 can be configured to operate in the 8-bit or 16-bit modes via IOCON.BANK.
There are two interrupt pins, INTA and INTB, that can be associated with their respective ports, or can be logically OR'ed together so that both pins will activate if either port causes an interrupt. A special mode (Byte mode with IOCON.BANK = 0) causes the address pointer to toggle between associated A/B register pairs. For example, if the BANK bit is cleared and the Address Pointer is initially set to address 12h (GPIOA) or 13h (GPIOB), the pointer will toggle between GPIOA and GPIOB. Note that the Address Pointer can initially point to either address in the register pair.
deviceStates
Constructor and Description |
---|
MCP23017() |
MCP23017(int interruptPinNumber) |
MCP23017(int interruptPinNumberA,
int interruptPinNumberB) |
MCP23017(int controller,
int address,
int interruptPinNumber) |
MCP23017(int controller,
int address,
int interruptPinNumberA,
int interruptPinNumberB) |
Modifier and Type | Method and Description |
---|---|
void |
close() |
void |
closePin(int pinNumber) |
String |
getName() |
boolean |
getValue(int pinNumber) |
GpioDigitalInputDeviceInterface |
provisionDigitalInputPin(int pinNumber,
GpioPullUpDown pud,
GpioEventTrigger trigger) |
GpioDigitalOutputDeviceInterface |
provisionDigitalOutputPin(int pinNumber,
boolean initialValue) |
void |
setValue(int pinNumber,
boolean value) |
void |
valueChanged(DigitalInputEvent event) |
closeAll, deviceClosed, deviceOpened, getDevice, isDeviceOpened
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
closeAll, deviceClosed, deviceOpened, isDeviceOpened
public MCP23017() throws RuntimeIOException
RuntimeIOException
public MCP23017(int interruptPinNumber) throws RuntimeIOException
RuntimeIOException
public MCP23017(int interruptPinNumberA, int interruptPinNumberB) throws RuntimeIOException
RuntimeIOException
public MCP23017(int controller, int address, int interruptPinNumber) throws RuntimeIOException
RuntimeIOException
public MCP23017(int controller, int address, int interruptPinNumberA, int interruptPinNumberB) throws RuntimeIOException
RuntimeIOException
public String getName()
getName
in interface DeviceFactoryInterface
public GpioDigitalInputDeviceInterface provisionDigitalInputPin(int pinNumber, GpioPullUpDown pud, GpioEventTrigger trigger) throws RuntimeIOException
provisionDigitalInputPin
in interface GpioDeviceFactoryInterface
RuntimeIOException
public GpioDigitalOutputDeviceInterface provisionDigitalOutputPin(int pinNumber, boolean initialValue) throws RuntimeIOException
provisionDigitalOutputPin
in interface GpioDeviceFactoryInterface
RuntimeIOException
public boolean getValue(int pinNumber) throws RuntimeIOException
RuntimeIOException
public void setValue(int pinNumber, boolean value) throws RuntimeIOException
RuntimeIOException
public void close() throws RuntimeIOException
close
in interface Closeable
close
in interface AutoCloseable
RuntimeIOException
public void closePin(int pinNumber) throws RuntimeIOException
RuntimeIOException
public void valueChanged(DigitalInputEvent event)
valueChanged
in interface InputEventListener<DigitalInputEvent>
Copyright © 2016 mattjlewis. All rights reserved.